How is this any different from a washing machines handwash/delicate program? It soaks in soap with no movement, cold temperatures, then rinse it gently with water.
I wish that's how mine did it, even on the hand wash/delicate setting, it still does 3 spin cycles (although I'd guess not as fast as the other modes). But more importantly, I hand wash so I can spot clean. Easiest way to spot deep stains etc is when the clothes are wet and you can hand inspect them. I'm so obsessive about this stuff i won't even accept any fade in the blacks, and no yellowing in my whites.